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The Royal Wedding Dress Exhibtion

LONDON - JULY 20: The Duke and Duchess of Cambridge's royal wedding cake is photographed before it goes on display at Buckingham Palace during the annual summer opening on July 20, 2011 in London, England. The cake was featured in the wedding of Catherine, Duchess of Cambridge to Prince William, Duke of Cambridge on April 29. (Photo by Lewis Whyld/WPA Pool/ Getty Images)

Royal wedding cake heads to auction

A slice of cake from the wedding of Prince William and Kate Middleton hits the auction block on May 3. The cake, which was designed by Fiona Cairns, will come in a special memento box with a starting bid of £100 (approximately $165).